TBH, if you make a breach on your contract with ANY company (and not just entertainment) you would face huge consequences. Most of them would fire you actually if you commited a fault important enough to compromise your work ( I don't know how important is the '' no marriage'' one, anyway, but judging by how the idol world is, I would say a lot)

Honestly, he is getting a better treatement than most of other idols or company employee who made a breach on their contract :/